Simple elixir script to rotate mp4 video in bulk using ffmpeg

bulk_rotate_video.exs

# Files need to be in same directory as this script
files = ["rotate_me_1", "rotate_me_2", "rotate_me_3"]

# Read more about rotating videos with ffmpeg here
# https://www.baeldung.com/linux/ffmpeg-rotate-video#:~:text=transpose%20is%20an%20FFmpeg%20filter,the%20values%20from%200%2D3.

# Run this from a new shell session to watch the progress of this script:
# `$ while true; do ps aux | grep ffmpeg; sleep 2; clear; done`

Task.async_stream(
  files,
  fn f ->
    IO.puts("START: Running ffmpeg rotation for file #{f}.MP4")

    System.cmd("ffmpeg", ["-y", "-i", "#{f}.MP4", "-vf", "transpose=2", "#{f}.mov"])

    IO.puts("END: Running ffmpeg rotation for file #{f}.MP4")
  end,
  max_concurrency: 3,
  timeout: :infinity
)
|> Enum.to_list()

IO.puts("Finished processing all videos! (files: #{files})")